Testing statistical Isotropy in Cosmic Microwave Background Polarization maps

Abstract

We apply our symmetry based Power tensor technique to test conformity of PLANCK Polarization maps with statistical isotropy. On a wide range of angular scales (l=40-150), our preliminary analysis detects many statistically anisotropic multipoles in foreground cleaned full sky PLANCK polarization maps viz., COMMANDER and NILC. We also study the effect of residual foregrounds that may still be present in the galactic plane using both common UPB77 polarization mask, as well as the individual component separation method specific polarization masks. However some of the statistically anisotropic modes still persist, albeit significantly in NILC map. We further probed the data for any coherent alignments across multipoles in several bins from the chosen multipole range.

11 pages, 6 figures, Accepted for publication in MNRAS

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• The angular scale of homogeneity in the Local Universe with the SDSS blue galaxies
• Clustering of Local Extrema in Planck CMB maps
• Evidence of isotropy at large-scale from polarizations of radio sources
• Application of Contour Minkowski Tensor and $\mathcal{D}$ Statistic to the Planck $E$-mode data
• A Pixel Space Method for Testing Dipole Modulation in the CMB Polarization
• Examining statistical isotropy of CMB low multipoles from Planck PR4 data
• CMB Polarization by the Asymmetric Template of Scalar Perturbations